Protostellar clusters in intermediate mass (IM) star forming regions A. Fuente, C. Ceccarelli, R. Neri, T. Alonso-Albi, P. Caselli, D. Johnstone, E. F. van Dishoeck and F. Wyrowski A&A, 468 3 (2007) L37-L40 Published online: 11 April 2007 DOI: 10.1051/0004-6361:20077297